<template>
  <div class="aCoursesList">
    <!-- 课程列表开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <!-- 课程类别展示 -->
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部"
                     href="javascript:void(0);"
                     @click="searchOne('')">全部</a>
                </li>
                <li v-for="(item,index) in subjectNestedList"
                    :key="index"
                    :class="{active:oneIndex==index}">
                  <a :title="item.title"
                     href="javascript:void(0);"
                     @click="searchOne(item.id, index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14" />
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(item,index) in subSubjectList"
                    :key="index"
                    :class="{active:twoIndex==index}">
                  <a :title="item.title"
                     href="javascript:void(0);"
                     @click="searchTwo(item.id, index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear" />
        </section>

        <!-- 排序方式 -->
        <div class="js-wrap">
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量"
                   href="javascript:void(0);"
                   @click="searchBuyCount()">销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新"
                   href="javascript:void(0);"
                   @click="searchGmtCreate()">最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格"
                   href="javascript:void(0);"
                   @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>

        </div>

        <div class="mt40">
          <!-- /无数据提示-->
          <section v-if="data.total==0"
                   class="no-data-wrap">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>

          <!-- 数据列表展示 -->
          <article v-if="data.total>0"
                   class="comm-course-list">
            <ul id="bna"
                class="of">
              <li v-for="item in data.items"
                  :key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover"
                         class="img-responsive"
                         alt="听力口语">
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id"
                         title="开始学习"
                         class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+item.id"
                       :title="item.title"
                       class="course-title fsize18 c-333">{{ item.title }}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span v-if="Number(item.price) === 0"
                          class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{ item.viewCount }}人学习</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear" />
          </article>
        </div>

        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a :class="{undisable: !data.hasPrevious}"
               href="#"
               title="首页"
               @click.prevent="gotoPage(1)">首</a>
            <a :class="{undisable: !data.hasPrevious}"
               href="#"
               title="前一页"
               @click.prevent="gotoPage(data.current-1)">&lt;</a>
            <a v-for="page in data.pages"
               :key="page"
               :class="{current: data.current == page, undisable: data.current == page}"
               :title="'第'+page+'页'"
               href="#"
               @click.prevent="gotoPage(page)">{{ page }}</a>
            <a :class="{undisable: !data.hasNext}"
               href="#"
               title="后一页"
               @click.prevent="gotoPage(data.current+1)">&gt;</a>
            <a :class="{undisable: !data.hasNext}"
               href="#"
               title="末页"
               @click.prevent="gotoPage(data.pages)">末</a>
            <div class="clear" />
          </div>
        </div>
      </section>
    </section>
  </div>
</template>

<script>
import course from '@/utils/api/course'
export default {
  data() {
    return {
      page: 1,
      data: {},
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: ""
    }
  },
  created() {
    this.initCourse()
    this.initSubject()
  },

  methods: {
    initCourse() {
      course.getPageList(1, 8, this.searchObj).then(response => {
        this.data = response.data.data
      })
    },
    initSubject() {
      course.getNestedTreeList2().then(response => {
        this.subjectNestedList = response.data.data.list
      })
    },
    searchOne(subjectParentId, index) {
      this.oneIndex = index
      this.twoIndex = -1

      this.searchObj.subjectId = ""
      this.subSubjectList = []

      this.searchObj.subjectParentId = subjectParentId
      this.goPage = (this.page)

      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (this.subjectNestedList[i].id === subjectParentId) {
          this.subSubjectList = this.subjectNestedList[i].children
        }
      }
    },
    // 点击二级分类，查询数据
    searchTwo(subjectId, index) {
      this.twoIndex = index
      this.searchObj.subjectId = subjectId;
      this.gotoPage(this.page)
    },
    // 购买量查询
    searchBuyCount() {
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },

    // 更新时间查询
    searchGmtCreate() {
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },

    // 价格查询
    searchPrice() {
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = "1";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },
    // 分页查询
    gotoPage(page) {
      this.page = page
      course.getPageList(page, 8, this.searchObj).then(response => {
        this.data = response.data.data
      })
    }
  }
}
</script>

<style>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>